Accession Number : ADA318773
Title : Development of New Nonlinear Optical Materials for Application to Sensor Protection.
Descriptive Note : Final rept. May 92-Nov 93,
Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES LOKER HYDROCARBON RESEARCH INST
Personal Author(s) : Dalton, Larry R. ; Healy, Edward M.
PDF Url : ADA318773
Report Date : SEP 1996
Pagination or Media Count : 46
Abstract : New ladder chromophores were synthesized and characterized for sensor protection applications. A similar effort was carried out for selected metallated pi-electron oligomers. Optical nonlinearity was characterized by both degenerate four-wave mixing (employing both femto- and picosecond pulses) and by pump-probe experiments. Large photo-induced absorption was observed for the new ladder chromophores. In all cases studied, the photo-induced absorption phenomena could be quantitatively described by a three level model. Relaxation to a highly absorbing 'gap' state was found to be preferred to direct electron-hole recombination. the relaxation time of the gap state was observed to vary from 40 picoseconds to 10 nanoseconds for various materials studied. The absorption cross section of the gap state was observed to be at least an order of magnitude greater than that of the ground state.
Descriptors : *DETECTORS, *OPTICAL MATERIALS, *NONLINEAR OPTICS, OPTICAL PROPERTIES, MODELS, CHROMOPHORES, HOLES(ELECTRON DEFICIENCIES), FOUR WAVE MIXING, ELECTRONS, PUMPING(ELECTRONICS), PROTECTION, QUANTUM ELECTRONICS, RELAXATION TIME, GROUND STATE, ABSORPTION CROSS SECTIONS, OLIGOMERS, METALLIZING.
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE